468
FNCA52 TJSJ 290730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST WED JUL 29 2026
DISCUSSION
EXPECT MINIMUM RELATIVE HUMIDITY VALUES NEAR OR ABOVE CRITICAL
THRESHOLDS TODAY, CRITICALLY DRY FUELS PERSIST ACROSS SOUTHERN
PUERTO RICO AND ST. CROIX. EAST-SOUTHEASTERLY WINDS ARE FORECAST
TO BECOME BREEZY TO WINDY FROM TODAY ONWARD, WHICH COULD PROMOTE
THE SPREAD OF ANY FIRE THAT DEVELOPS. ADDITIONALLY, A DRIER
AIRMASS ACCOMPANIED BY SAHARAN DUST WILL SPREAD OVER THE REGION
LATER THIS AFTERNOON. RESIDENTS AND VISITORS SHOULD AVOID OUTDOOR
BURNING AND EXERCISE CAUTION WITH ACTIVITIES THAT COULD GENERATE
SPARKS OR OPEN FLAMES. FIRE WEATHER PARTNERS SHOULD CONTINUE TO
MONITOR THE FORECAST.
PRZ014-292000-
SOUTHEAST COASTAL PLAINS-
330 AM AST WED JUL 29 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 10 10
TEMP (24H TREND) 91 (+1) 75 (-2) 92
RH % (24H TREND) 58 (-5) 91 (+2) 51
WIND 20FT/EARLY(MPH) E 17 E 14 E 23
WIND 20FT/LATE(MPH) E 18 E 16 E 23
MIXING HGT(FT-AGL/MSL)4850 5070
TRANSPORT WND (MPH) E 23 E 25
VENT RATE (KT-FT) 97000 111540
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-292000-
SOUTHERN HILLS-
330 AM AST WED JUL 29 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 0 0
TEMP (24H TREND) 89 (+3) 71 (-3) 90
RH % (24H TREND) 64 (-4) 97 (+3) 56
WIND 20FT/EARLY(MPH) E 14 E 12 E 17
WIND 20FT/LATE(MPH) E 14 E 16 E 17
MIXING HGT(FT-AGL/MSL)5340 5330
TRANSPORT WND (MPH) E 22 E 24
VENT RATE (KT-FT) 101460 111930
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-292000-
NORTH COASTAL PLAINS-
330 AM AST WED JUL 29 2026
TODAY TONIGHT THU
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 10
TEMP (24H TREND) 91 (+1) 74 (-3) 92
RH % (24H TREND) 61 (-5) 98 (+2) 57
WIND 20FT/EARLY(MPH) E 16 E 16 E 18
WIND 20FT/LATE(MPH) E 20 E 16 E 20
MIXING HGT(FT-AGL/MSL)5370 5660
TRANSPORT WND (MPH) E 21 E 23
VENT RATE (KT-FT) 96660 113200
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-292000-
NORTHERN HILLS-
330 AM AST WED JUL 29 2026
TODAY TONIGHT THU
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 10 10
TEMP (24H TREND) 91 (+2) 72 (-2) 91
RH % (24H TREND) 64 (-3) 99 (0) 58
WIND 20FT/EARLY(MPH) E 13 E 13 E 16
WIND 20FT/LATE(MPH) E 18 E 11 E 18
MIXING HGT(FT-AGL/MSL)6560 6690
TRANSPORT WND (MPH) E 17 E 20
VENT RATE (KT-FT) 98400 113730
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-292000-
WEST COAST-
330 AM AST WED JUL 29 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 30
TEMP (24H TREND) 93 (+2) 73 (-2) 94
RH % (24H TREND) 61 (-6) 98 (+1) 56
WIND 20FT/EARLY(MPH) E 14 E 16 E 18
WIND 20FT/LATE(MPH) E 17 E 11 E 18
MIXING HGT(FT-AGL/MSL)4270 5240
TRANSPORT WND (MPH) E 15 E 20
VENT RATE (KT-FT) 55510 89080
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-292000-
EASTERN INTERIOR-
330 AM AST WED JUL 29 2026
TODAY TONIGHT THU
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 20
TEMP (24H TREND) 90 (+2) 73 (-3) 90
RH % (24H TREND) 63 (-2) 98 (+2) 58
WIND 20FT/EARLY(MPH) E 16 E 14 E 17
WIND 20FT/LATE(MPH) E 17 E 18 E 17
MIXING HGT(FT-AGL/MSL)5750 5670
TRANSPORT WND (MPH) SE 22 E 23
VENT RATE (KT-FT) 109250 113400
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-292000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST WED JUL 29 2026
TODAY TONIGHT THU
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 20 30
TEMP (24H TREND) 85 (+3) 71 (-3) 85
RH % (24H TREND) 70 (-5) 99 (+1) 65
WIND 20FT/EARLY(MPH) E 14 E 12 E 14
WIND 20FT/LATE(MPH) E 16 E 14 E 14
MIXING HGT(FT-AGL/MSL)4150 4980
TRANSPORT WND (MPH) SE 23 E 26
VENT RATE (KT-FT) 83000 114540
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-292000-
CENTRAL MOUNTAIN RANGE-
330 AM AST WED JUL 29 2026
TODAY TONIGHT THU
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE TSTMS NONE SHOWERS
CHANCE PRECIP (%) 30 0 30
TEMP (24H TREND) 87 (+4) 69 (-3) 89
RH % (24H TREND) 69 (-5) 100 (+2) 60
WIND 20FT/EARLY(MPH) E 11 E 9 E 13
WIND 20FT/LATE(MPH) SE 12 E 8 E 13
MIXING HGT(FT-AGL/MSL)6780 6830
TRANSPORT WND (MPH) SE 17 E 18
VENT RATE (KT-FT) 101700 109280
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-292000-
CAYEY MOUNTAIN RANGE-
330 AM AST WED JUL 29 2026
TODAY TONIGHT THU
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 10 30
TEMP (24H TREND) 84 (+1) 71 (-2) 86
RH % (24H TREND) 72 (0) 99 (0) 65
WIND 20FT/EARLY(MPH) E 13 E 11 E 14
WIND 20FT/LATE(MPH) E 13 E 13 E 14
MIXING HGT(FT-AGL/MSL)4970 5120
TRANSPORT WND (MPH) E 23 E 25
VENT RATE (KT-FT) 99400 112640
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-292000-
VIEQUES-
330 AM AST WED JUL 29 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 10
TEMP (24H TREND) 91 (+2) 79 (-1) 91
RH % (24H TREND) 58 (-4) 83 (-3) 56
WIND 20FT/EARLY(MPH) E 19 E 18 E 20
WIND 20FT/LATE(MPH) E 19 E 20 E 17
MIXING HGT(FT-AGL/MSL)3200 3890
TRANSPORT WND (MPH) E 23 E 26
VENT RATE (KT-FT) 64000 89470
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-292000-
CULEBRA-
330 AM AST WED JUL 29 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 10
TEMP (24H TREND) 91 (+2) 79 (-2) 91
RH % (24H TREND) 60 (-9) 88 (+1) 58
WIND 20FT/EARLY(MPH) E 19 E 19 E 20
WIND 20FT/LATE(MPH) E 19 E 20 E 17
MIXING HGT(FT-AGL/MSL)3300 4080
TRANSPORT WND (MPH) E 25 E 28
VENT RATE (KT-FT) 72600 97920
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-292000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST WED JUL 29 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 0
TEMP (24H TREND) 93 (+3) 75 (-2) 94
RH % (24H TREND) 58 (-5) 92 (+3) 52
WIND 20FT/EARLY(MPH) E 20 E 21 E 24 G32
WIND 20FT/LATE(MPH) E 24 E 18 E 24 G31
MIXING HGT(FT-AGL/MSL)4610 4960
TRANSPORT WND (MPH) E 25 E 29
VENT RATE (KT-FT) 101420 124000
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-292000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST WED JUL 29 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 0
TEMP (24H TREND) 89 (+2) 78 (-2) 89
RH % (24H TREND) 61 (-7) 88 (0) 59
WIND 20FT/EARLY(MPH) E 20 E 19 E 20
WIND 20FT/LATE(MPH) E 20 E 21 E 18
MIXING HGT(FT-AGL/MSL)3300 3920
TRANSPORT WND (MPH) E 26 E 29
VENT RATE (KT-FT) 75900 98000
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-292000-
ST CROIX-
330 AM AST WED JUL 29 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 0
TEMP (24H TREND) 90 (+2) 78 (-2) 90
RH % (24H TREND) 61 (-7) 90 (-1) 61
WIND 20FT/EARLY(MPH) E 19 E 19 E 20
WIND 20FT/LATE(MPH) E 20 E 20 E 17
MIXING HGT(FT-AGL/MSL)4450 5280
TRANSPORT WND (MPH) E 29 E 28
VENT RATE (KT-FT) 111250 126720
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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